Although the scenarios of the post-war Europe are still unfolding, there is one certainty—the world plunged into a new energy paradigm, one of the clean energy technologies. The last 2 years reshaped the global energy systems. These tectonic shifts are impacting the energy systems at all levels: from normative to technological; from changing fossil fuels flows to rerouting supply chains and critical raw materials; from expanding oil and gas infrastructure to enhancing the power grid networks, etc. As a response this global transformation toward the green transition and decarbonisation but also with the aim to address the climate change while mitigating the ongoing energy related risks of the Russian war, Ukraine undertook strategic decisions aiming to meet the European Green Deal agenda goals. The post-war Ukraine, the second largest country in Europe, plays a key role in overcoming and balancing European geographic disparities of the green transformation. As a member of the Energy Community Treaty, and with the opening of European Union (EU) membership negotiations, but also in the context of the recently adopted international climate change targets within COP28, Ukraine has the potential and responsibility to become an important contributor to the regional and European green transition. This paper suggests that the ongoing war and the global energy shift creates momentum for Ukraine to become a regional and European driver of change within the new, multilayered energy security concept with the green agenda at its forefront.